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Q6: Oxygen is abundant in the atmosphere but
Q13: This area of the desert southwest is
Q13: So far, the oldest mineral found on
Q13: _ sediments are deposited or precipitated as
Q31: Hydrogen ions given off by natural acids
Q33: A deviation from average reading is called
Q34: _ beds form the main body of
Q37: _ dunes in the Sahara are as
Q39: Both graphite and diamond are made of
Q50: The mineral _ reacts with weak hydrochloric